如何依次从Java执行wsl命令？

Question

I want to execute wsl commands from java .

I'm trying to do this using Process and ProcessBuilder .

As I understand, there are two ways to do this:

1. Run wsl along with command as argument (for example: wsl ls -l ) (do this per-command).
2. Run wsl , and then execute the commands one by one.

But there are some problems with 1 and 2 .

With point 1 :

1. When the command terminates, the process does not stop. So even if i run wsl ls , I can not determine the moment when I can call next command.
2. wsl does not save the state between such calls, so it's not very convenient

With point 2 :

Since wsl does not show bash prompt , I can not track when the command stopped displaying information. For example:

ProcessBuilder pb = new ProcessBuilder("wsl");
pb.redirectErrorStream(true);
Process p = pb.start();
Thread.sleep(1000);
OutputStreamWriter osw = new OutputStreamWriter(p.getOutputStream());
osw.write("ls\n");
osw.flush();

And all I can read is:

build.gradle
gradle
gradlew
gradlew.bat
out
settings.gradle
src 

No selya@selya-pc:/mnt/c/Users/selya$ read. So I can't use it as a separator between commands. I think that wsl somehow tracks, in what environment it was launched, for example, through isatty() , and therefore the output is different.

With both:

Аs far as I know, for programs that are running outside the terminal, stdout is not buffered. So there are some problems with, for example, sudo , because it asks fro a password without newline / flush ( [sudo] password for selya: ), therefore I can't read this line...

I found a solution - pass command as argument to unbuffer util, for example:

wsl unbuffer -p sudo apt-get update 

( -p stands for pipeline ).

But other problems still remain. Is there any way to do this? Or maybe there is lib for it? Even c or c++ lib will suit my needs...

PS I tried to find a solution for several days. Russian-speaking SO didn't help me, that's why I'm here. Sorry for my English...

Answer 1

The problem was solved with the help of pty4j . It works on linux, mac and windows. (It works like pseudo terminal on linux, but have nice java interface).